BA6129AF-E2 Rohm Semiconductor, BA6129AF-E2 Datasheet

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BA6129AF-E2

Manufacturer Part Number
BA6129AF-E2
Description
IC RESET W/BATT BACKUP SOP8 TR
Manufacturer
Rohm Semiconductor
Type
Battery Backup Circuitr
Datasheet

Specifications of BA6129AF-E2

Number Of Voltages Monitored
1
Output
Open Drain or Open Collector
Reset
Active Low
Voltage - Threshold
3.5V
Operating Temperature
-20°C ~ 75°C
Mounting Type
Surface Mount
Package / Case
8-SOP
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Reset Timeout
-

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
BA6129AF-E2
Manufacturer:
ROHM
Quantity:
8 000
The BA6129AF, BA6162, and BA6162F are reset ICs with a battery backup function, designed for equipment using
SRAMs and other similar components. These ICs are configured of a reset signal and CS signal output unit and a
power supply switching unit. If the BA6129AF detects that the power supply has dropped to 3.5V or lower, it outputs
the CS, CSB, and Reset signals to set the SRAM in backup mode. If the voltage drops to 3.3V or lower, the power
supply switches to the battery. With the BA6162 and BA6162F, in the same way, a power supply of 4.2V is detected,
and if the voltage drops to 3.3V or lower, the power supply switches to the battery. These ICs allow SRAMs to be
write protected and allow the system to be reset, in addition to switching between the power supply and the battery.
Equipment using SRAMs (cards, cassettes, facsimile machines, copiers, word processors, personal computers, etc.)
1) Equipped with battery backup function.
2) Equipped with both CS signals (CS and CSB) and
3) Low current dissipation when powered from battery.
I
OUT1
1 Reduced by 9.0mW for each increase in Ta of 1 C over 25 C.
2 Reduced by 5.5mW for each increase in Ta of 1 C over 25 C.
Applications
Features
Absolute maximum ratings (Ta = 25°C)
Power supply voltage
Output current 1
Output current 2
Power dissipation
Operating temperature
Storage temperature
Reset IC with battery backup function
BA6129AF / BA6162 / BA6162F
Memory ICs
Reset signals.
indicates the output current on the V
Parameter
CC
side, and I
Symbol
Topr
I
I
Tstg
V
OUT1
OUT2
Pd
CC
OUT2
– 80 (BA6129AF)
– 40 (BA6162 / BA6162F)
the output current on the V
900
550
– 20 ~ + 75
– 40 ~ + 125
1
2
– 200
(BA6162)
(BA6129AF)
(BA6162F)
Limits
7.0
4) Low voltage loss when powered from battery.
5) Smooth switching between power supply and bat-
tery.
BAT
side.
Unit
mW
mA
V
C
C
A
1

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BA6129AF-E2 Summary of contents

Page 1

... SRAMs and other similar components. These ICs are configured of a reset signal and CS signal output unit and a power supply switching unit. If the BA6129AF detects that the power supply has dropped to 3.5V or lower, it outputs the CS, CSB, and Reset signals to set the SRAM in backup mode. If the voltage drops to 3.3V or lower, the power supply switches to the battery ...

Page 2

... GND Pin 4 Battery power supply Pin 8 Power supply ( Pin 6 Power supply output REF – + – + – GND Reset CS Function — Pin 3 CS output 3 GND 8 GND BA6129AF / BA6162 / BA6162F CSB BAT V CC Pin 5 6 CSB output 5 Pin 6 Power supply output GND 4 6 ...

Page 3

... Memory ICs • Electrical characteristics BA6129AF (unless otherwise noted 25°C, VR Parameter No-load current dissipation voltage differential 1 Vo output voltage 1 Vo output voltage 2 Vo output voltage 3 Detection voltage Detection hysteresis voltage Reset output low level voltage Reset leakage current Reset operating limit voltage ...

Page 4

... BH – 0.05 — 0.05 VB — I — 0.5 CCB — V 0.20 0.03 SAT2 2.70 — 2.60 — 2. – 0.5 — — — I — 0.1 OR BA6129AF / BA6162 / BA6162F = 10k ) RES Unit Conditions 5V BAT 5V 3V BAT 5V 3V BAT 5V 3V BAT 5V 3V BAT ...

Page 5

... Memory ICs • Measurement circuit OPL BA6129AF / BA6162 / BA6162F – V SAT RES BA6129AF R RES (BA6162 / F) 10k GND I RES RES OPL S Fig 200k CSB CSB CCB BAT ...

Page 6

... CS signal (CS-Low, CSB-High) are output by the logic output function, and the SRAM (or other memory device) is switched to backup mode. If the power supply V the switching voltage (BA6129AF and BA6162 / F: V 3.3Vtyp. when V rises), the SBD develops a forward bias because the PNP power transistor is off. The power supply output ...

Page 7

... CC These ICs are designed to operate with at V but can also operate at V values of other than 5V. CC However, the following conditions must be met: (equation < V < CCMax. V – V < BAT BA6129AF / BA6162 / BA6162F ref – + – + – BATTERY 3V Fig. 3 (2) Battery voltage V = 5V, ...

Page 8

... OUTPUT CURRENT Fig. 8 Output voltage vs. output current (!) (when power supply is detected BAT 10k RES RES POWER SUPPLY VOLTAGE: V Fig. 11 CSB output voltage vs. power supply voltage BA6129AF / BA6162 / BA6162F 10k RES RES (V) POWER SUPPLY VOLTAGE Fig. 6 Reset output voltage vs. power supply voltage 2 10k ...

Page 9

... SOP8 5 4.9 4.8 4 OUTPUT CURRENT: I Fig. 14 Output voltage vs. output current (!) (when power supply is detected) BA6162 0.15 BA6129AF / BA6162 / BA6162F 2 BAT = 10k RES = V RES CC 2.8 2.7 2 100 OUTPUT CURRENT: I (mA) O Fig. 15 Output voltage vs. output current (@) (when using battery backup) 9 ...

Page 10

Appendix No technical content pages of this document may be reproduced in any form or transmitted by any means without prior permission of ROHM CO.,LTD. The contents described herein are subject to change without notice. The specifications for the product ...

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